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5
6
7#include <linux/clk.h>
8#include <linux/module.h>
9
10#include <sound/soc.h>
11
12#include "spdif.h"
13
14
15
16
17
18static int set_audio_clock_heirachy(struct platform_device *pdev)
19{
20 struct clk *fout_epll, *mout_epll, *sclk_audio0, *sclk_spdif;
21 int ret = 0;
22
23 fout_epll = clk_get(NULL, "fout_epll");
24 if (IS_ERR(fout_epll)) {
25 printk(KERN_WARNING "%s: Cannot find fout_epll.\n",
26 __func__);
27 return -EINVAL;
28 }
29
30 mout_epll = clk_get(NULL, "mout_epll");
31 if (IS_ERR(mout_epll)) {
32 printk(KERN_WARNING "%s: Cannot find mout_epll.\n",
33 __func__);
34 ret = -EINVAL;
35 goto out1;
36 }
37
38 sclk_audio0 = clk_get(&pdev->dev, "sclk_audio");
39 if (IS_ERR(sclk_audio0)) {
40 printk(KERN_WARNING "%s: Cannot find sclk_audio.\n",
41 __func__);
42 ret = -EINVAL;
43 goto out2;
44 }
45
46 sclk_spdif = clk_get(NULL, "sclk_spdif");
47 if (IS_ERR(sclk_spdif)) {
48 printk(KERN_WARNING "%s: Cannot find sclk_spdif.\n",
49 __func__);
50 ret = -EINVAL;
51 goto out3;
52 }
53
54
55 clk_set_parent(mout_epll, fout_epll);
56 clk_set_parent(sclk_audio0, mout_epll);
57 clk_set_parent(sclk_spdif, sclk_audio0);
58
59 clk_put(sclk_spdif);
60out3:
61 clk_put(sclk_audio0);
62out2:
63 clk_put(mout_epll);
64out1:
65 clk_put(fout_epll);
66
67 return ret;
68}
69
70
71
72
73
74static int set_audio_clock_rate(unsigned long epll_rate,
75 unsigned long audio_rate)
76{
77 struct clk *fout_epll, *sclk_spdif;
78
79 fout_epll = clk_get(NULL, "fout_epll");
80 if (IS_ERR(fout_epll)) {
81 printk(KERN_ERR "%s: failed to get fout_epll\n", __func__);
82 return -ENOENT;
83 }
84
85 clk_set_rate(fout_epll, epll_rate);
86 clk_put(fout_epll);
87
88 sclk_spdif = clk_get(NULL, "sclk_spdif");
89 if (IS_ERR(sclk_spdif)) {
90 printk(KERN_ERR "%s: failed to get sclk_spdif\n", __func__);
91 return -ENOENT;
92 }
93
94 clk_set_rate(sclk_spdif, audio_rate);
95 clk_put(sclk_spdif);
96
97 return 0;
98}
99
100static int smdk_hw_params(struct snd_pcm_substream *substream,
101 struct snd_pcm_hw_params *params)
102{
103 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
104 struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
105 unsigned long pll_out, rclk_rate;
106 int ret, ratio;
107
108 switch (params_rate(params)) {
109 case 44100:
110 pll_out = 45158400;
111 break;
112 case 32000:
113 case 48000:
114 case 96000:
115 pll_out = 49152000;
116 break;
117 default:
118 return -EINVAL;
119 }
120
121
122
123
124 ratio = 512;
125 rclk_rate = params_rate(params) * ratio;
126
127
128 ret = set_audio_clock_rate(pll_out, rclk_rate);
129 if (ret < 0)
130 return ret;
131
132
133 ret = snd_soc_dai_set_sysclk(cpu_dai, SND_SOC_SPDIF_INT_MCLK,
134 rclk_rate, SND_SOC_CLOCK_IN);
135 if (ret < 0)
136 return ret;
137
138 return ret;
139}
140
141static const struct snd_soc_ops smdk_spdif_ops = {
142 .hw_params = smdk_hw_params,
143};
144
145SND_SOC_DAILINK_DEFS(spdif,
146 DAILINK_COMP_ARRAY(COMP_CPU("samsung-spdif")),
147 DAILINK_COMP_ARRAY(COMP_CODEC("spdif-dit", "dit-hifi")),
148 DAILINK_COMP_ARRAY(COMP_PLATFORM("samsung-spdif")));
149
150static struct snd_soc_dai_link smdk_dai = {
151 .name = "S/PDIF",
152 .stream_name = "S/PDIF PCM Playback",
153 .ops = &smdk_spdif_ops,
154 SND_SOC_DAILINK_REG(spdif),
155};
156
157static struct snd_soc_card smdk = {
158 .name = "SMDK-S/PDIF",
159 .owner = THIS_MODULE,
160 .dai_link = &smdk_dai,
161 .num_links = 1,
162};
163
164static struct platform_device *smdk_snd_spdif_dit_device;
165static struct platform_device *smdk_snd_spdif_device;
166
167static int __init smdk_init(void)
168{
169 int ret;
170
171 smdk_snd_spdif_dit_device = platform_device_alloc("spdif-dit", -1);
172 if (!smdk_snd_spdif_dit_device)
173 return -ENOMEM;
174
175 ret = platform_device_add(smdk_snd_spdif_dit_device);
176 if (ret)
177 goto err1;
178
179 smdk_snd_spdif_device = platform_device_alloc("soc-audio", -1);
180 if (!smdk_snd_spdif_device) {
181 ret = -ENOMEM;
182 goto err2;
183 }
184
185 platform_set_drvdata(smdk_snd_spdif_device, &smdk);
186
187 ret = platform_device_add(smdk_snd_spdif_device);
188 if (ret)
189 goto err3;
190
191
192 ret = set_audio_clock_heirachy(smdk_snd_spdif_device);
193 if (ret)
194 goto err4;
195
196 return 0;
197err4:
198 platform_device_del(smdk_snd_spdif_device);
199err3:
200 platform_device_put(smdk_snd_spdif_device);
201err2:
202 platform_device_del(smdk_snd_spdif_dit_device);
203err1:
204 platform_device_put(smdk_snd_spdif_dit_device);
205 return ret;
206}
207
208static void __exit smdk_exit(void)
209{
210 platform_device_unregister(smdk_snd_spdif_device);
211 platform_device_unregister(smdk_snd_spdif_dit_device);
212}
213
214module_init(smdk_init);
215module_exit(smdk_exit);
216
217MODULE_AUTHOR("Seungwhan Youn, <sw.youn@samsung.com>");
218MODULE_DESCRIPTION("ALSA SoC SMDK+S/PDIF");
219MODULE_LICENSE("GPL");
220
